Question

Efectuati:
$a) \:(3 - 2 \sqrt{5} ) ^{2} \\b) \: (2 + \sqrt{7} ) ^{2} \: \: \: \\ c) \: ( \sqrt{3} - \sqrt{2 } ) ^{3} \\ d) \: (5 + \sqrt{5} ) ^{3 \: \: \: }$
eu sunt cl IX
urgent​

Answer 1

$a. \: \: (3 - 2\sqrt{5}) {}^{2} = (9 - 4 \times 5) \\ = 9 - 20 = - 11 \\ \\b. \: \: (2 + \sqrt{7} ) {}^{2} = 4 + 7 = 11 \\ \\ c. \: \: ( \sqrt{3} - \sqrt{2} ) {}^{3} = 3\sqrt{3} - 2 \sqrt{2} \\ \\ d. \: \: (5 + \sqrt{5} ) {}^{3} = 125 + 5 \sqrt{5} = 5(25 + \sqrt{5} ) \: \: \:$

Sper ca este bine!! :D